JP3498364B2 - Car - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for adjusting the height of an automobile such as an agricultural vehicle. 2. Description of the Related Art There is a managed rice transplanter which can selectively mount a planting work machine or other working machine on a traveling vehicle body and can be used not only for seedling planting work but also for management work. Is being developed. When performing planting work, it is preferable that the vehicle height of the traveling vehicle body is low because the aircraft is stable.However, in the case of management work performed when rice grows to some extent, the vehicle height of the traveling vehicle Must be higher. Therefore, a traveling vehicle body for such a managed rice transplanter is provided with a mechanism for adjusting the vehicle height by moving the front and rear wheels up and down with respect to the body. [0003] With regard to the rear wheel vertical movement mechanism, the rear wheel is supported by a vertically rotatable support, and the rear wheel is vertically rotated by an actuator such as a hydraulic cylinder. Is moved up and down with respect to the fuselage. Therefore, when the rear wheel is moved up and down, the rear wheel is simultaneously moved back and forth. For example, if the rear wheel is supported by the support eccentrically to the front and downward of the rotational center, when moved downward (vehicle height increasing) the rear wheel with respect to the machine body, moving the rear wheel rearward And a wider wheelbase. In order to improve operability when turning, this type of traveling vehicle is configured such that the rear wheels are configured as side clutches and brakes. When the rear wheels are disengaged, the rear wheels are simultaneously braked. Had become. [0005] In adjusting the vehicle height of the traveling vehicle body having the above-described structure, there are inconveniences in the following cases. For example, when trying to raise the vehicle height on the ridge in the field with the front part of the aircraft facing the ridge side, the rear wheels are braked and cannot move, so the front wheels try to move forward to widen the wheelbase. However, because the front wheels were in contact with the ridge, they could not move forward and could not adjust the vehicle height. It is possible for people to get on and off the step floor of the traveling vehicle from the front of the aircraft, and to stop on the ridge with the front of the aircraft facing the ridge side to actually get on and off the farm road or ridge. Many. Therefore, it is extremely inconvenient that the vehicle height cannot be adjusted in the above state. Therefore, there is a long-awaited demand for a traveling vehicle body capable of adjusting the vehicle height even at the side of a ridge. Means for Solving the Problems In order to solve the above problems, the present invention is configured as follows. That is, the vehicle according to the present invention includes a front wheel 2 and a driving rear wheel 3 and is capable of moving the driving rear wheel 3 in an up-down direction and a front-back direction by an actuator without braking the driving rear wheel 3. A transmission stopping means for stopping transmission to the driving rear wheel is provided, and the driving rear wheel 3 is arranged so as to be located on the front side as it is positioned higher and to be located at the rear side as it is positioned lower, and the front wheel axle 2a Front case 8 that supports
Is a vertical axis case 7 provided at the end of the front axle 6.
The lower end portion is provided so as to be rotatable around a rotation center axis 8a.
The rotation of the vertical axis 7a provided inside the vertical axis case is
1, G2 and the torque transmitted through the counter shaft 7b
The front wheel 2 moves up and down by rotating the front wheel final case 8 in a substantially front half range of the circumferential trajectory , and the front wheel axle at the front wheel raising position FW1.
2a is slightly before the top dead center Z1 in the circumferential locus.
The front wheel axle 2a is located at the front wheel lowering position FW2.
It is located at a position slightly beyond the bottom dead center Z2 in the circumferential locus.
So that the front wheel lowering position FW2 and the front wheel raising
At the position FW1 , the further rotation of the front wheel final case 8 is restricted by the stoppers S1 and S2 . The driving rear wheel, which is moved up and down and back and forth by the actuator, can freely move back and forth when the transmission is stopped without braking, and the back and forth movement of the other wheels is restrained. Even if there is, you can adjust the vehicle height. The higher the driving rear wheel is, the higher the front wheel is, and the lower the rear wheel is, the lower the rear wheel. Attempts to move rearward with respect to the aircraft, but this force is supported by the stopper, and the movement of the front wheels is restricted. Also, the front wheels
The front wheel final case covers almost the front half of the circumference
It is raised and lowered by turning, and the front wheeled vehicle is in the front wheel raised position
The axis is located slightly before the top dead center in the circumferential locus.
Position, and the front wheel axle
It is set to be located slightly beyond the bottom dead center.
Therefore, rotate the final case to the rotatable side.
Requires force against the weight of the aircraft,
The front wheels are stable. [0008] Hereinafter, as an example of an automobile according to the present invention,
The traveling vehicle body of the managed rice transplanter shown in FIGS. The traveling vehicle body 1 is a four-wheel drive vehicle and includes a pair of left and right front wheels 2 and 2 and rear wheels 3 and 3 as driving wheels. Front axle cases 6 and 6 extend to the left and right sides from the left and right side surfaces of a transmission case 5 arranged at the front of the fuselage. The front wheel final cases 8, 8 are rotatably provided around pivot shafts 8a, 8a, and the front wheel axles 2a, 2a projecting outward from the outside of the front wheel final cases 8, 8 are attached to the front wheels 2, 2a. 2 are attached. The vertical axis case 7 includes an upper case 7U on the front axle case side and a lower case 7L on the front wheel final case side, and the lower case 7L can be turned with respect to the upper case 7U. The front wheel axle 2a is eccentric from the rotation center axis 8a, and the front wheel final case 8 around the rotation center axis 8a.
, The vertical position of the front wheel 2 with respect to the body can be adjusted. The rotation range of the front wheel final case 8 is substantially the front half range θ of the circumference regulated by the pair of stoppers S1 and S2 fixed to the outer surface of the front wheel final case 8 and the stopper receiver 9 fixed to the lower case 7L. Has become. As shown in FIG.
When the front wheel 2 is engaged with the engaging portion 9a of the stopper receiver 9, the front wheel raising position FW1 (the vehicle height h
₁ ), and as shown in FIG.
When the front wheel 2 is engaged with the engagement portion 9b of the stopper receiver 9, the front wheel lowering position FW2 (the vehicle height h
₂ ) The method of adjusting the front wheel up and down will be described later. After adjustment to the respective positions FW1 and FW2, fixing bolts 100,... Inserted from the longitudinal axis case 7 side are screwed into the front wheel final case 8 to fix both cases 7, 8 so as not to rotate. The front wheel raising position FW1 is located at the top dead center Z1 of the circumference when the front wheel final case 8 is rotated upward.
Is set to a position slightly closer to the front, and the front wheel lowering position F
W2 is set at a position slightly beyond the bottom dead center Z2 of the circumference when the front wheel final case 8 is rotated downward. This is because when the front wheel is in the front wheel raising position FW1 or the front wheel lowering position FW2, a force against the weight of the body is required to rotate the front wheel final case 8 to the rotatable side. This is because the front wheel 2 is stabilized. The rotation of the vertical axis 7a in the vertical axis case 7 is transmitted to the counter shaft 7b by bevel gears G1 and G2.
Further, the transmission is transmitted from the counter shaft 7b to the rotation center shaft 8a of the front wheel final case 8 by the gears G3 and G4. Conventionally, as shown in FIG.
a, the lower part of the longitudinal case 7 containing the bevel gears G1 and G2 protrudes below the lower part of the front wheel final case 8 at the front wheel raising position FW1. For this reason, there was an obstacle that the lower part of the vertical axis case 7 pushed mud during work in the paddy field. On the other hand, the lower part of the vertical axis case 7 of this embodiment is the front wheel final case 8.
Because it does not protrude below the lower part of the area, there is little mud pushing when working in paddy fields. The thrust surfaces of the longitudinal axis case 7 and the front wheel final case 8 are sealed by an O-ring 101. Further, a C-shaped retaining ring 102 for preventing the two cases 7 and 8 from coming off is attached to the distal end of the cylindrical portion of the vertical axis case 7. The C-shaped retaining ring 102 has a gap d between the C-shaped retaining ring 102 and the front wheel final case 8 in a state where the longitudinal axis case 7 and the front wheel final case 8 are fixed. Therefore, when adjusting the vehicle height, the fixing bolt 1
When 00,... Are removed, the front wheel final case 8 moves by the gap d in a direction away from the longitudinal axis case 7 due to the elasticity of the O-ring 101, the pressing allowance of the O-ring 101 decreases, and the rotation of the front wheel final case 8 is reduced. Dynamic resistance is reduced. The front wheel 2 has a disk-shaped wheel disc 10
The tire 107 is formed by attaching an annular rim 106 to the outer periphery of the tire 5 and rubber-molding the periphery thereof to form a tire 107. The inner periphery of the wheel disc 105 is set on a flange 120 fixed to the front wheel axle 2a by bolts 121,. It is fixed and attached at. A cover 123 that covers the inside of the front wheel 2 with almost no gap is attached to the front wheel final case 8 that has entered the inside of the front wheel 2. Therefore, intrusion of mud into the front wheel 2 during the planting operation is prevented, and mud pushing by the front wheel final case 8 does not occur. Further, the crop is not caught in the front wheel 2 during the management work. The front ends of a pair of left and right main frames 10, 10 are fixed to the back of the transmission case 5, and a horizontal frame 11 is fixed to the rear ends of the main frames 10, 10. And the horizontal frame 11
A rear wheel rolling shaft 12 whose center is oriented horizontally in the front-rear direction is fixedly fitted to the left and right central portions of the vehicle, and a rear wheel frame 13 is supported by a protruding portion of the rear wheel rolling shaft so as to be freely rollable. Rear wheel input cases 15, 15 are integrally provided at left and right end portions of the rear wheel frame 13, and are rear wheel support members rotatable around the rotation center shafts 16a, 16a with respect to the rear wheel input case. Rear wheel final cases 16, 16 are provided, and rear wheel axles 3a, 3 protruding outward from outer portions thereof.
The rear wheels 3, 3 are attached to a. The rear wheel axle 3a is eccentric from the rotation center axis 16a, and the rotation center axis 16a
When the angle of the surrounding rear wheel final case 16 changes, the vertical position of the rear wheel 3 with respect to the fuselage changes, and the wheelbase changes. The actuators for changing the angles of the rear wheel final cases 16, 16 are rear wheel lifting cylinders 18, 18. The rear wheel lifting cylinders 18 are double-acting hydraulic cylinders, and the cylinder body side is the main frame 1
The pistons are pivotally connected to the pivoting arms 0 and 10, and the piston side is connected to the distal ends of swing arms 20 and 20 fixed to cylindrical bodies 19 and 19 rotatably fitted to the outer peripheral portion of the rear wheel frame 13. The left and right rear wheel lifting cylinders 18 are common rear wheel lifting valves 2.
5 (see FIG. 11). Cylindrical body 19, 19
In addition to the swing arms 20, 20, the interlocking arms 22, 2,
The distal end of the interlocking arm 22, 22 is rotatably connected to connection shafts 23, 23 protruding from the inner surfaces of the rear wheel final cases 16, 16. The rear wheel final cases 16, 16 are moved by extending and retracting the rear wheel lifting cylinders 18, 18, as shown in FIG.
In the range of α in the rear wheel final case 1
When the wheels 6, 16 rotate upward, the rear wheels 3, 3 rise with respect to the body (the vehicle height H _1). ), Rear wheel final case 16,16
Rear wheels 3 is lowered but to aircraft when rotated downward (height H _2). The front and rear positions of the rear wheels 3 and 3 are closer to the front as the rear wheels 3 and 3 are higher, and the front and rear positions of the rear wheels 3 and 3 are closer to the rear as the rear wheels 3 and 3 are lower. The engine 30 includes main frames 10, 10
It is provided on. The rotational power of the engine 30 is transmitted to the HST 32 via the first belt transmission 31 and transmitted to the generator 34 via the second belt transmission 33. Further, the rotational power after the speed change by the HST 32 is transmitted to the transmission case 5 via the third belt transmission 36 having a continuously variable transmission mechanism, and the hydraulic pump 3 is transmitted via the fourth belt transmission 37.
8,39. Further, the power is transmitted from the HST input shaft 32a to a general-purpose clutch 48 for driving a working machine other than the planting working machine via a fifth belt transmission 47 . The transmission between the transmission pulley 36a of the third belt transmission 36 and the transmission input shaft 5a is configured as a main clutch A. The rotational power input to the transmission case 5 via the main clutch A is changed into a power for traveling and a power for work equipment after being shifted by the main transmission B. The driving power is transmitted via the front differential device C to the left and right front axles 6a, 6a, and the vertical axes 7a, 7a.
a, the rotation center shafts 8a, 8a, and the front wheel axles 2a, 2a, and the left and right rear differential shafts 5b, 5b, the rear wheel output shafts 5c, 5c, and the rear wheel transmission shaft 40 via the rear differential device D. , 40, rear wheel input shafts 15a, 15a, rotation center shafts 16a, 16a, and rear wheel axles 3a, 3a. The differential devices C and D have differential lock mechanisms Ca and Da for stopping the differential function. From the rear differential shafts 5b, 5b to the rear wheel output shaft 5
The side clutch / brake E, E shown in FIG. G1 in FIG.
Is a bevel gear attached to the rear differential shaft 5b, and g2 is a bevel gear rotatably fitted to the rear wheel output shaft 5c. The side clutch 41 is a multi-plate clutch, and the driving plate 41 of the outer cylinder 41a is spline-fitted to the bevel gear g2.
are opposed to the passive plates 41d of the inner cylinder 41c provided integrally with the rear wheel output shaft 5c, and the slider 41f is connected to the outer cylinder 41 by ring-shaped leaf springs 41e.
a, the driving plates 41b,... and the passive plates 41d,. Shifter 41
g is released from the pressing of the outer cylinder 41a by the slider 41f, the driving plates 41b,.
... comes off and the clutch goes off. The brakes 42 press the shoes 42b,... Against the drums 42a,... Attached to the rear wheel output shaft 5c to brake the rotation of the rear wheel output shaft 5c. When operating the shifter 41g to the clutch disengagement side,
The slider 41f presses the disk 42c and the shoe 42
.. press the drums 42a,..., the rear wheel 3 is braked in conjunction with the side clutch disengagement operation. The rear wheel brake pedals 55E, 55E for operating the side clutches and brakes E, E are provided with transmission stop means for stopping transmission to the rear wheels without braking the rear wheels 3, 3. ing. As shown in FIG. 12, the transmission stopping means has a projection 55a formed on the outer peripheral surface of the base of the rear wheel brake pedal 55E.
Arc-shaped resistance member 55c provided with a concave portion 55b which engages with
Is pressed against the base by the spring 55d. [0024] is in the position of P ₁ when not pedaling, steering clutch 41 is ON, and a state in which no brake 42 is applied. Comes to the position of P ₂ pedal slightly stepped up and the projection 55a is engaged with the recess 55b, a slight resistance applied to foot pedal. At this time, the side clutch 41 is disengaged and the brake 42 is not applied. Further, at the position of the P ₃ depresses the pedal, the side clutch 41 is a switching, and the brake 42
It is in the state where it was applied. The rear wheel transmission shaft 40 is connected to the rear wheel output shaft 5c and the rear wheel input shaft 1 via universal joints 43,43.
The rear wheel transmission shaft 40 is connected to the rear wheel 3a and the rear wheel transmission shaft 40. The rear wheel transmission shaft 40 is configured to be extendable and contractible. It has become available. The power for the working machine is transmitted to the planting clutch case 46 via the working machine drive shaft 45 after being shifted by the inter-stock transmission F, where it is separated into the PTO shaft 46a and the fertilizer drive shaft 46b. Taken out. The planting clutch case 46 has a built-in planting clutch G that turns on and off the drive of the planting machine and stops the planting machine at a predetermined phase when the machine is turned off. The control seat 50 is installed on an engine cover 51 that covers the upper side of the engine 30. A steering handle 53 is provided above a front cover 52 in front of the steering seat 50. Also, the front cover 5
2 and various levers 54,
, Various pedals 55, etc. are provided. The lower part of the engine cover 51 and the lower part of the front cover 52 form a horizontal floor step 57 on which the operator can walk. The rear wheel frame 13 has a stand 5
8 is rotatably provided in a state of being lowered downward and a state of being stored horizontally. When using the stand 58, the stand 58 is lowered with the rear wheels 3, 3 lowered with respect to the fuselage, and thereafter, the rear wheels 3, 3 are raised with respect to the fuselage to support the fuselage with the stand 58. To do. Since the stand 58 is provided on the rear wheel frame 13 that can be rolled freely, the aircraft does not tilt left and right even when used on an uneven surface such as an unpaved agricultural road. The work implement mounting device 59 has a parallel link configuration, and includes one upper link 60 and a pair of lower links 61, 61 on the left and right sides. These links 60, 61,
61 is rotatably attached to a link base frame 62 whose base side is provided upright at the rear ends of the main frames 10, 10, and a traveling vehicle-side hitch 63 is connected to its distal end. A work machine elevating cylinder 65 is interposed between a support member (not shown) fixed to the main frames 10, 10 and a distal end of a swing arm 64 integrally formed with the upper link 60, and extends and contracts the cylinder. Accordingly, the upper link 60 rotates up and down, and the working machine mounted on the traveling vehicle body side hitch 63 moves up and down with a substantially constant posture. The working machine lifting cylinder 65 is provided with the working machine lifting valve 6.
6 (see FIG. 11). The hydraulic circuit is constructed as shown in FIG.
That is, two hydraulic pumps 38 and 39 are provided, and one hydraulic pump 38 sends oil to the rear wheel elevating cylinders 18 and 18 and the work implement elevating cylinder 65, and the other hydraulic pump 3
Numeral 9 sends oil to a torque generator 68 for power steering. Also, the working machine lifting valve 6
Oil is supplied to the rear wheel elevating valve 25 only when 6 is neutral. The traveling vehicle body 1 is configured as described above, and the vertical positions of the front wheels 2, 2 and the rear wheels 3, 3 with respect to the body are appropriately adjusted according to the work purpose. Further, the traveling vehicle 1 is provided with a horizontal sensor 24 for detecting the front-back inclination of the body, and based on the detection result of the horizontal sensor, front-rear horizontal control for maintaining the body in front-rear horizontal can also be performed. ing. The front wheel is moved from the raised position FW1 to the lowered position FW2.
If you can, put the mission to the reverse, depressing the left and right rear wheel brake pedal 55E, the 55E full to the position of P _3. Then, at the same time as the side clutch 41, 41 is disengaged, the rear wheel brakes 42, 42 are applied, and the rear wheel 3,
The rotation of 3 stops. On the other hand, since the front wheels 2, 2 are still rotating, the front wheels 2, 2 try to roll on the ground. Since the frictional resistance between the rear wheels 3, 3 and the ground is greater than the propulsive force of the front wheels 2, 2, the aircraft cannot move,
As a result, the front wheel final cases 8, 8 are
The front wheels 2 and 2 rotate in the direction opposite to the rotational driving direction of the front wheels with the a and 8a as fulcrums, and the front wheels 2 and 2 are lowered from the raised position FW1 to the lowered position FW2.
Move to Conversely, when the front wheels are to be moved from the lowered position FW2 to the raised position FW1, the transmission is put forward, and the rear wheel brake pedals 55E, 55E are depressed. Then, the front wheel final cases 8, 8 rotate in a direction opposite to the direction when the front wheels are lowered, and the front wheels 2, 2 rise with respect to the body. If the front differential device C is locked during the rotation of the front wheel final case, the left and right front wheel final cases 8, 8 rotate uniformly, so that the front wheel up and down adjustment is stably performed. . Further, when raising and lowering the rear wheels 3, 3, the transmission is shifted to neutral and the rear wheel brake pedal 55E,
55E in a state where-depth up to the position of P _2, thereby stretching the rear wheel lifting cylinder 18, 18. Then, the rear wheel final cases 16, 16 are rotated vertically about the rotation center shafts 16a, 16a as fulcrums, and the vertical positions of the rear wheels 3, 3 are changed.
At the time of this rear wheel up / down operation, the rear wheel brake pedals 55E, 55
Since 5E is operated to P _2, the side clutch 4
1, 41 are off, and the rear wheel brakes 42, 42 are not applied, and the rear wheels 3, 3 are freely rotatable. Therefore, the wheel base can be adjusted by rolling the rear wheels 3 and 3 backward on the ground, and as shown in FIG. 3 can be reduced. When the front / rear horizontal control is functioned, the rear wheel lifting cylinders 18 are controlled so that the detection value of the horizontal sensor 24 is maintained horizontal, and the front wheel final case 8 is controlled in accordance with the rotation of the front wheel final case 8. Rear wheel final case 16,1
6 also rotates up and down, and the vertical position of the rear wheels 3, 3 with respect to the body changes. This allows the vehicle height to be adjusted while keeping the aircraft level. When used for planting work, as shown in FIG.
9 is equipped with a planting work machine 70. In the state of FIG. 13, a fertilizer application device 80 is provided on the rear side of the control seat 50, and fertilizer is applied near the side of the seedlings planted simultaneously with planting of the seedlings. Also. When used for management work, as shown in FIG.
9 is equipped with a particle sprayer 90. As described above, the motor vehicle according to the present invention has a structure in which the driving wheels are moved in the vertical direction and the front-rear direction by using the actuator, and the vehicle height and the wheel base are simultaneously adjusted. By stopping the transmission to the driving wheel without braking the driving wheel, the vehicle height can be adjusted even when the longitudinal movement of the other wheels is restricted. Also, when lowering the front wheel and lowering the driving rear wheel, such as at the edge of a ridge, the front wheel contacts the ridge and attempts to move rearward with respect to the aircraft, but this force is supported by the stopper, and the movement of the front wheel is restricted. It is now reliably prevented. If this force is to be received by a drive device that rotates the final case, it is necessary to make the drive device robust and large. However, in the present invention, the movement of the front wheels is prevented by a relatively simple structure. Is possible. In addition, the front wheel raised position
The front wheel axle is slightly less than the top dead center
The front wheel axle is located at the front position and the front wheel axle is
So that it is located slightly above the bottom dead center in the trajectory
Since it is set, the final case can be turned
In order to rotate in the direction of the aircraft, a force against the weight of the aircraft is required,
The front wheels are stabilized at each position. Also, the front wheel final
The rotation of the vertical axis provided inside the vertical case is
Since rotation is transmitted via the bell gear and the counter shaft,
The lower part of the shaft case is lower than the lower part of the final case.
It can be prevented from protruding to the side, when working in paddy fields
Of the final case is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view of a traveling vehicle body. FIG. 2 is a plan view in which a part of a traveling vehicle body is omitted. FIG. 3 is a front sectional view of a front wheel supporting portion. FIG. 4 is an enlarged view of a main part of FIG. 3; FIGS. 5A and 5B are side views of the front wheel supporting portion, in which FIG. 5A illustrates a state in which the front wheel is in a raised position, and FIG. FIG. 6 is a rear cross-sectional view of the rear wheel support. FIG. 7 is a side view of a rear wheel support. FIG. 8 is a side view of a main part of the traveling vehicle body. FIG. 9 is a transmission system diagram. FIG. 10 is a diagram illustrating a half of a side clutch / brake in an outer shape and a remaining half in a cross section. FIG. 11 is a hydraulic circuit diagram. FIG. 12 is a side view of a rear wheel brake pedal. FIG. 13 is a side view of the managed rice transplanter showing a state where the planting work machine is mounted. FIG. 14 is a side view of the managed rice transplanter showing a state where the particulate matter spreader is mounted. FIG. 15 is a front sectional view of a conventional front wheel supporting portion. [Description of Signs] 1 Running body (automobile) 2 Front wheel 3 Rear wheel 18 Rear wheel elevating cylinder (actuator) 55E Rear wheel brake pedal 59 Work implement mounting device 70 Planting work machine 80 Fertilizer application device 90 Sprayer for granular materials

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masaru Nomura 1st Hachikura, Tobe-cho, Iyo-gun, Ehime Prefecture Iseki Agricultural Machinery Co., Ltd. Technical Department Co., Ltd. (72) Inventor Kazushi Ochi 1 Toya-cho, Ibe-gun, Ehime Prefecture, Hachikura Iseki Agricultural Machinery Co., Ltd. Technical Department (56) Reference JP-A-5-56711 (JP, A) JP-A-1-153332 ( JP, A) JP-A-62-273127 (JP, A) JP-A-56-153116 (JP, U) JP-A-3-95725 (JP, U) JP-A-62-187928 (JP, U) (58) ) Surveyed field (Int.Cl. ⁷ , DB name) A01C 11/02 B60G 17/00 B60K 17/30 B62D 11/08

Claims (1)

(57) All Claims and a 1. A front wheel 2 and the rear drive wheel 3, the motor vehicle and movable driving rear wheel 3 in the vertical direction and the longitudinal direction by an actuator, the driving rear wheels 3 Transmission stop means for stopping transmission to the driving rear wheel without braking, and the driving rear wheel 3 is configured to be located on the front side as being higher, and to be located rearward as being lower. And a front wheel final case 8 supporting the front wheel axle 2a.
Is a vertical axis case 7 provided at the end of the front axle 6.
The lower end portion is provided so as to be rotatable around a rotation center axis 8a.
The rotation of the vertical axis 7a provided inside the vertical axis case is
1, G2 and the torque transmitted through the counter shaft 7b
The front wheel 2 moves up and down by rotating the front wheel final case 8 in a substantially front half range of the circumferential trajectory , and the front wheel axle at the front wheel raising position FW1.
2a is slightly before the top dead center Z1 in the circumferential locus.
The front wheel axle 2a is located at the front wheel lowering position FW2.
It is located at a position slightly beyond the bottom dead center Z2 in the circumferential locus.
So that the front wheel lowering position FW2 and the front wheel raising
An automobile characterized in that the further rotation of the front wheel final case 8 is restricted by the stoppers S1 and S2 at the position FW1 .